the incident exposes the dangerous loopholes in the nation's gun laws. and minnesota's system of criminal background checks. joining me now is cnn legal contributor paul callan. this is such a disturbing case at the heart of the gun debate. advocates say don't take away guns, do the background checks. others say it's not enough. in this case it failed. legally speaking, what is the fix? >> you know, you're right. this is a terrifying example of the utter failure of gun control regulation that's are currently in place. this is a functional equivalent of the character jason from the "halloween" movie getting out of the mental hospital and being armed with ak-47s, this desert eagle semi automatic magnum, and the other of the 13 weapons he had on him. it's a shocking, shocking case. it happened because of a combination of factors. one, although minnesota has a through requires you to go to a police station and get a permit to purchase these kinds of weapons, they don't require you to be fingerprinted or show a social security number. he went into a police st